- Ads Contents E-mail Find Home iMac Resources Mac OS 8.6 Special Report Introduction Installation Font Bug Compatibility Notes Fixes and Updates Related Apple Updates Introduction On May 10, in conjunction with WWDC '99, Apple released Mac OS 8.6, a free upgrade for Mac OS 8.5 owners, available in 10 international languages. Highlights of Mac OS 8.6 include: Open Transport 2.0.3, which fixes DHCP ...www.macintouch.com/m86.html